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Engine & Performance

Choose from Engine & Performance products for Harley-Davidson, American V-twin and compatible motorcycle applications. Across the range you will find products for engine components. Compatibility varies, so match the stated model, year and technical details before ordering.

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£17.98
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Colony Manifold Intake Seals. Plumber Style – 1940–1954 74"/61" OHV Big Twin…

Only 2 left!

Colony Manifold Intake Seals. Plumber Style – 1940–1954 74"/61" OHV Big Twin… Brass seals. Used between manifold and cylinder head. OEM replacement...

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£17.98
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£17.98
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£17.59
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£32.77
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Colony Plumber Style – 1940–1954 OHV 74"/61" Big Twin…

Only 2 left!

Colony Plumber Style – 1940–1954 OHV 74"/61" Big Twin… Black parkerized Fitment 40-54 OHV 74"/61" Big Twin; 53-56 K; KH Product Details Brand: Co...

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£40.59
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Colony Plumber Style – 1940–1954 OHV 74"/61" Big Twin…

Only 2 left!

Colony Plumber Style – 1940–1954 OHV 74"/61" Big Twin… Chrome Fitment 40-54 OHV 74"/61" Big Twin; 53-56 K; KH Product Details Brand: Colony Cate...

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£40.59
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£40.59
£39.74
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£197.46
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£166.95
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MCS Legacy, 3.3 Gallon Sportster Gas Tank. Dished – 1983–2003 XL Sportster

Only 3 left!

MCS Legacy, 3.3 Gallon Sportster Gas Tank. Dished – 1983–2003 XL Sportster 3.3 gallon (12.5 liters) fuel tank. Dished style. For 22mm petcock (not ...

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£197.46
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£197.46
£166.95
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£166.95
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£199.10
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£168.34
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MCS Legacy, 3.3 Gallon XL Sportster Gas Tank. Dished. Fuel Inj – 2007–2022 XL Sportster Fuel Injected…

Only 3 left!

MCS Legacy, 3.3 Gallon XL Sportster Gas Tank. Dished. Fuel Inj – 2007–2022 XL Sportster Fuel Injected… 3.3 gallon (12.5 liters) fuel tank. Dished s...

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£199.10
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£168.34
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£217.76
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£194.87
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MCS 57-85 Sportster Billet Tappet Block Set. Polished – 1957–1985 XL Sportster

Only 3 left!

MCS 57-85 Sportster Billet Tappet Block Set. Polished – 1957–1985 XL Sportster Billet aluminum. USA made. Replaces 18607-57B. Fitment 57-85 XL Spor...

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£194.87
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£120.19
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Jims 57-85 Sportster Billet Tappet Block. Polished – 1957–1985 XL Sportster

Out of stock

Jims 57-85 Sportster Billet Tappet Block. Polished – 1957–1985 XL Sportster Polished. Precision machined from a 7075-T651 billet aluminum bar; whic...

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£120.19
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£566.43
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£469.72
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MCS Twin Cam Rocker Cover Kit, Custom Style – 1999–2017 Twin Cam

Only 2 left!

MCS Twin Cam Rocker Cover Kit, Custom Style – 1999–2017 Twin Cam Chrome plated. Custom style 2-piece die-cast aluminum imported rocker box kit; inc...

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£469.72
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MCS Braided Steel Oil Line & Bracket Kit – 1984–1999 Big Twin

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MCS Braided Steel Oil Line & Bracket Kit – 1984–1999 Big Twin Complete with all required components. With chrome plated billet gauge bracket an...

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£61.17
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MCS Oil Pressure Gauge Kit Rocker Box, 0-60 PSI. Chrome – Twin Cam: 2000–2017 Softail; 1999–2005…

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MCS Oil Pressure Gauge Kit Rocker Box, 0-60 PSI. Chrome – Twin Cam: 2000–2017 Softail; 1999–2005… Comes with a 60 PSI gauge. Kits mount to the rear...

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£56.30
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James Gaskets 4-Speed Transmission Gasket & Seal Kit – 1936–1986 4-Speed Big Twin

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James Gaskets 4-Speed Transmission Gasket & Seal Kit – 1936–1986 4-Speed Big Twin Incl. both 34924-36 for ratchet type shifter cover gasket and...

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£51.17
£51.56
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Mikuni Smoothbore Jet Needles, -98

Only 2 left!

Mikuni Smoothbore Jet Needles, -98 HSR 45 only Product Details Brand: Mikuni Category: INTAKE > JETS > JETS MIKUNI Unit: 1 Product code:...

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£15.93
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£17.89
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Mikuni Smoothbore Jet Needles, -97

Only 2 left!

Mikuni Smoothbore Jet Needles, -97 HSR 45 only Product Details Brand: Mikuni Category: INTAKE > JETS > JETS MIKUNI Unit: 1 Product code:...

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£17.89
£15.93
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£17.89
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£15.93
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Mikuni Smoothbore Jet Needles, -96

Out of stock

Mikuni Smoothbore Jet Needles, -96 HSR 45 only Product Details Brand: Mikuni Category: INTAKE > JETS > JETS MIKUNI Unit: 1 Product code:...

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£17.89
£15.93
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£17.89
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Mikuni Smoothbore Jet Needles, -95

Only 2 left!

Mikuni Smoothbore Jet Needles, -95 HSR 45 only Product Details Brand: Mikuni Category: INTAKE > JETS > JETS MIKUNI Unit: 1 Product code:...

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£17.89
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£17.89
£15.93
£15.93 - £15.93
£15.93
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£17.89
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£17.89
£15.93
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Mikuni Smoothbore Jet Needles, -98

Only 4 left!

Mikuni Smoothbore Jet Needles, -98 HSR 42 only Product Details Brand: Mikuni Category: INTAKE > JETS > JETS MIKUNI Unit: 1 Product code:...

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£17.89
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£17.89
£15.93
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£15.93
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£17.89
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£17.89
£15.93
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Mikuni Smoothbore Jet Needles, -97

Only 3 left!

Mikuni Smoothbore Jet Needles, -97 HSR 42 only (std size) Product Details Brand: Mikuni Category: INTAKE > JETS > JETS MIKUNI Unit: 1 Pr...

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£17.89
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£17.89
£15.93
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£15.93
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£17.89
£17.89 - £17.89
£17.89
£15.93
£15.93 - £15.93
£15.93

Mikuni Smoothbore Jet Needles, -96

Only 3 left!

Mikuni Smoothbore Jet Needles, -96 HSR 42 only Product Details Brand: Mikuni Category: INTAKE > JETS > JETS MIKUNI Unit: 1 Product code:...

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£17.89
£17.89 - £17.89
£17.89
£15.93
£15.93 - £15.93
£15.93
Save 11% Save %
Save 11% Save %
£17.89
£17.89 - £17.89
£17.89
£15.93
£15.93 - £15.93
£15.93

Mikuni Smoothbore Jet Needles, -95

Only 1 left!

Mikuni Smoothbore Jet Needles, -95 HSR 42 only Product Details Brand: Mikuni Category: INTAKE > JETS > JETS MIKUNI Unit: 1 Product code:...

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£17.89
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£17.89
£15.93
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£15.93
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£4.79
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£4.79
£4.27
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£4.27

Mikuni Smoothbore Jets, Main 190

Only 1 left!

Mikuni Smoothbore Jets, Main 190 Standard for HSR 48 Product Details Brand: Mikuni Category: INTAKE > JETS > JETS MIKUNI Unit: 1 Product...

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£4.79
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£4.79
£4.27
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£4.27
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£4.79
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£4.27
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Mikuni Smoothbore Jets, Main 150

Only 3 left!

Mikuni Smoothbore Jets, Main 150 150 Product Details Brand: Mikuni Category: INTAKE > JETS > JETS MIKUNI Unit: 1 Product code: 514836

£4.79
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£4.27
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£4.27
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£4.91
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Mikuni Smoothbore Jets, Pilot 17.5

Only 3 left!

Mikuni Smoothbore Jets, Pilot 17.5 17.5 Product Details Brand: Mikuni Category: INTAKE > JETS > JETS MIKUNI Unit: 1 Product code: 514831

£4.91
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£4.38
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£131.68
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Mikuni HSR42 Jet Assortment Kit

Only 3 left!

Mikuni HSR42 Jet Assortment Kit Mikuni HSR42 carbs Product Details Brand: Mikuni Category: INTAKE > JETS > JETS KEIHIN Unit: KIT Product...

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£129.85
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MCS Main Jet for Keihin Butterfly Carb. #165 – 1976–1989 Big Twin; 1976–1987 XL…

Only 1 left!

MCS Main Jet for Keihin Butterfly Carb. #165 – 1976–1989 Big Twin; 1976–1987 XL… OEM replacement reference 27419-76. Fitment 76-89 Big Twin; 76-87 ...

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£1.46
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